Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f35b5195b7d1360…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 01:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a5819d38780f9a506fa852b03a1471b SHA-1: 1374dcbbef56e5cd78cd31b9d1335f2f1fcf2846 SHA-256: 1f35b5195b7d1360b617ca2a7edede34ebc4561e2bf22462ac6654b373888413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.douggoodkin.com/admin/ckfinder/userfiles/files/zowexetatitedosogolavux.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/65356714370.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/ziruniruwizolofo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdcfbf927---54484816305.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/binun.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf40765325---sopina.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/66857072857.pdfIn PDF document text
    • http://fittbikese.hu/files/file/29505829521.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8b5572b70c2a89d7b93e1fc4359bd332/57755343825.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/wizusuraburetawofexarex.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/1086517767.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/23981715128.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/botavaxetetigonuva.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b469f4e2a5---75493464683.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83566407693.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/lakuwokovate.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/marud.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/6509481723.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/regexibamid.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/tutuwejeja.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/51224138230.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/1361610119.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/jifedefoxafozisovevesu.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/josovotozuwezoxudi.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/64419650704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=list+of+screen+reader+for+android+devicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 18076 bytes
SHA-256: 9e16a04a1e8295155bad68b8e0d4e3738d4555ec8fba6a7013cab77f64758dda
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10444 bytes
SHA-256: 7e8db1b4c4a2d13dbbc7f47cca04d3d36d90683c80b49a90b9de7a3ba0caa9e4
font_02_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1